Electro-optical Apparatus Segmented Capacitor Wiring for Luminance Uniformity
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Solution Overview
Problem
Existing electro-optical apparatuses with organic EL elements face challenges in achieving sufficient light emission due to limited physical space for driving circuits, leading to luminance irregularities and inefficiencies in charging and discharging processes.
Innovation Solution
The apparatus is designed with a matrix arrangement of unit circuits connected to multiple wirings, where only a subset of capacitor elements are charged and discharged in each unit period, allowing for longer charging and discharging times and reducing luminance irregularities by overlapping unit periods and using parasitic capacitance associated with the wirings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the capacitance of the capacitor element is increased to obtain sufficient light emitting amount, then the light emitting luminance is improved, but the physical area required for installation increases
Solution Approach 1:
The patent divides a single data line into multiple wirings (first wiring and second wiring) and segments the capacitor elements into two groups: first capacitor elements connected to the first wiring and second capacitor elements connected to the second wiring. This segmentation allows independent control and charging/discharging operations on different groups, reducing the required capacitance per element while maintaining sufficient light emitting luminance.
Solution Approach 2:
Instead of charging all capacitor elements simultaneously, the patent charges only a subset (first capacitor elements) during the writing period while others (second capacitor elements) are charged during the driving period. This partial action approach allows sufficient charging time for each group without requiring all elements to be fully charged concurrently, reducing the required capacitance value.
2Illumination intensity
If concurrent charging and discharging of all capacitor elements is performed, then the light emitting amount is sufficient, but the charging and discharging time becomes excessively long
Solution Approach 1:
The patent segments capacitor elements into two groups (first and second capacitor elements) that are charged and discharged at different times. First capacitor elements are charged during the writing period and discharged during the driving period, while second capacitor elements are charged during the driving period. This temporal segmentation reduces the concurrent charging/discharging time requirement while maintaining sufficient light emitting amount through sequential operation.
Solution Approach 2:
The patent implements periodic charging and discharging cycles for different capacitor element groups. During each unit period, first capacitor elements undergo charging in the writing period and discharging in the driving period, while second capacitor elements undergo charging in the driving period. This periodic action ensures sufficient charging time for each group without requiring all elements to be charged simultaneously, thus reducing the overall time loss.
3Reliability
If the writing time and light emitting time are maintained constant, then the driving timing is stable, but sufficient charging or discharging cannot be performed leading to luminance irregularity
Solution Approach 1:
The patent segments capacitor elements into two groups with different charging schedules. First capacitor elements are charged during the writing period while second capacitor elements are charged during the driving period. This segmentation allows each group to receive sufficient charging time within the constant unit period, ensuring both driving timing stability and sufficient charge accumulation for uniform luminance without requiring extended writing or light emitting times.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration effectively prevents luminance irregularities and reduces the need for additional capacitor elements, resulting in improved image quality and cost-effectiveness while maintaining constant writing and light emitting times.
Implementation Method 1
a capacitor element which has a first electrode connected to a capacitor line and a second electrode connected to any one of the respective wirings included in the data line
Implementation Method 2
an electro-optical element which provides gradation corresponding to the data electric potential
Implementation Method 3
a switching element which is arranged between the second electrode and the electro-optical element and is switched on when the scanning line is selected by the scanning line driving circuit
Data Source
AI summary
A electro-optical apparatus includes: a plurality of unit circuits arranged to correspond to intersections of scanning lines and data lines; a scanning line driving circuit; and a data line driving circuit. Each unit circuit includes: an electro-optical element which provides gradation corresponding to the data electric potential; a capacitor element which has a first electrode connected to a capacitor line and a second electrode connected to the data line; and a switching element. A second electrode of the capacitor element included in one of the plurality of unit circuits is connected to one wiring of the respective wirings included in the data line. The second electrode of the capacitor element included in another unit circuit is arranged in parallel with the one unit circuit along an extension direction of the data line and is connected to another wiring of the respective wirings included in the data line.